Garmin GPS 175 Manual

GPS 175/GNX 375
Pilot's Guide

© 2019
Garmin International, Inc., or its subsidiaries
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190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide i
Table of Contents
1 SYSTEM AT A GLANCE ..................................................................................................... 1-1
Overview ...................................................................................................................................................1-2
1.1 Display Layout ........................................................................................... 1-3
1.2 Unit Functions .......................................................................................... 1-4
Pilot Interface ........................................................................................................................................1-5
1.3 Unit Power ................................................................................................ 1-5
1.3.1 Instrument Test .................................................................................. 1-5
1.3.2 Power Off .......................................................................................... 1-5
1.4 SD Card Slot ............................................................................................. 1-6
1.5 Touchscreen ............................................................................................. 1-7
1.5.1 Keys ................................................................................................... 1-8
1.5.2 Menus ................................................................................................ 1-9
1.5.3 Tabs ................................................................................................. 1-10
1.5.4 Keypads ........................................................................................... 1-10
1.6 Control Knobs ........................................................................................ 1-11
1.6.1 Knob Function Indicators .................................................................. 1-11
1.6.2 Screen Captures ............................................................................... 1-12
1.7 Color Conventions .................................................................................. 1-13
Compatible Equipment ..................................................................................................................1-14
1.8 Line Replaceable Units .......................................................................... 1-14
1.8.1 ADC & AHRS .................................................................................... 1-14
1.8.2 Altitude Encoder .............................................................................. 1-15
1.8.3 ADS-B In Data .................................................................................. 1-15
2 GET STARTED ........................................................................................................................ 2-1
Databases .................................................................................................................................................2-2
2.1 Database Effective Cycles .......................................................................... 2-3
2.2 Active and Standby Databases .................................................................. 2-4
2.3 Manual Updates ....................................................................................... 2-5
2.3.1 Database Updates Page ...................................................................... 2-5
2.4 Automatic Updates ................................................................................... 2-8
2.5 Database Concierge .................................................................................. 2-9
2.5.1 Wi-Fi Setup ...................................................................................... 2-11
Connectivity .........................................................................................................................................2-12
2.6 Connext Setup ........................................................................................ 2-12
2.7 Bluetooth Setup ...................................................................................... 2-13
2.7.1 Enabling Bluetooth ........................................................................... 2-13
2.7.2 Managing Paired Devices .................................................................. 2-14
2.7.3 Importing a Flight Plan ..................................................................... 2-14
XPDR ........................................................................................................................................................2-15
2.8 XPDR Control Panel ................................................................................ 2-15
2.9 XPDR Setup ............................................................................................ 2-16
2.9.1 Displaying Data ................................................................................ 2-16
2.9.2 Enabling Extended Squitter Transmissions ......................................... 2-16
2.9.3 Assigning a Flight ID ......................................................................... 2-16
2.10 XPDR Modes ......................................................................................... 2-17
2.11 Squawk Code Keys ............................................................................... 2-18
2.11.1 VFR ................................................................................................ 2-18
2.11.2 XPDR Key ....................................................................................... 2-18
2.12 Remote Control .................................................................................... 2-20

ii GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
Table of Contents
2.13 XPDR Alert ............................................................................................ 2-20
ADS-B Altitude Reporting .............................................................................................................2-21
2.14 ADS-B Control Panel ............................................................................. 2-21
2.14.1 ADS-B Key ...................................................................................... 2-22
2.14.2 Enabling Anonymous Mode ........................................................... 2-22
2.14.3 Assigning a Flight ID ....................................................................... 2-23
2.15 GDL 88 Alert ......................................................................................... 2-23
Pilot Settings ........................................................................................................................................2-24
2.16 CDI Scale .............................................................................................. 2-24
2.16.1 Horizontal Alarm Limits .................................................................. 2-25
2.16.2 CDI On Screen ................................................................................ 2-26
2.17 Airport Runway Criteria ........................................................................ 2-27
2.17.1 Runway Surface ............................................................................. 2-27
2.17.2 Minimum Runway Length .............................................................. 2-27
2.18 Clocks & Timers .................................................................................... 2-28
2.18.1 Timers ............................................................................................ 2-28
2.18.2 Clock ............................................................................................. 2-28
2.19 Page Shortcuts ...................................................................................... 2-29
2.20 Alerts Settings ....................................................................................... 2-30
2.21 Unit Selections ...................................................................................... 2-31
2.22 Display Brightness Control .................................................................... 2-32
2.22.1 Automatic Brightness Control ......................................................... 2-32
2.22.2 Manual Brightness Control ............................................................. 2-32
2.23 Scheduled Messages ............................................................................ 2-33
2.23.1 Message Types ............................................................................... 2-33
2.23.2 Modifying Scheduled Messages ...................................................... 2-33
Status Indications ..............................................................................................................................2-34
2.24 Alert Types ............................................................................................ 2-34
2.24.1 Alert Annunciations ........................................................................ 2-35
2.24.2 Pop-up Alerts ................................................................................. 2-36
2.24.3 Aural Alerts .................................................................................... 2-36
2.25 System Status Page ............................................................................... 2-37
2.26 GPS Status Page .................................................................................... 2-37
2.26.1 Circle of Uncertainty ....................................................................... 2-39
2.26.2 SBAS Providers ............................................................................... 2-40
2.26.3 GPS Status Annunciations .............................................................. 2-40
2.26.4 GPS Alerts ...................................................................................... 2-41
2.27 ADS-B Status Page ................................................................................ 2-42
Logs ...........................................................................................................................................................2-43
2.28 Export to SD Card ................................................................................ 2-43
3 NAVIGATION ......................................................................................................................... 3-1
Map ..............................................................................................................................................................3-3
3.1 Map Setup ................................................................................................ 3-6
3.1.1 Configure User Fields ......................................................................... 3-7
3.1.2 Map Orientation ................................................................................. 3-8
3.1.3 North Up Above ................................................................................. 3-9
3.1.4 Visual Approach ................................................................................. 3-9
3.1.5 TOPO Scale ........................................................................................ 3-9
3.1.6 Range Ring ....................................................................................... 3-10

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide iii
Table of Contents
3.1.7 Track Vector ..................................................................................... 3-10
3.1.8 Ahead View ..................................................................................... 3-10
3.1.9 Map Detail ....................................................................................... 3-11
3.2 Map Interactions ..................................................................................... 3-13
3.2.1 Basic Interactions .............................................................................. 3-13
3.2.2 Graphical Flight Plan Editing ............................................................. 3-15
3.3 Map Overlays .......................................................................................... 3-19
3.3.1 Overlay Controls ............................................................................... 3-19
3.3.2 Overlay Status Icons ......................................................................... 3-22
3.3.3 Smart Airspace ................................................................................. 3-23
3.3.4 SafeTaxi ........................................................................................... 3-24
Active Flight Plan ..............................................................................................................................3-26
3.4 Collapse All Airways ................................................................................ 3-28
3.5 OBS ........................................................................................................ 3-28
3.6 Dead Reckoning ...................................................................................... 3-30
3.7 Parallel Track ........................................................................................... 3-31
3.8 Edit Data Fields ....................................................................................... 3-33
3.9 Flight Plan Catalog .................................................................................. 3-33
3.9.1 Catalog Route Options ..................................................................... 3-34
3.10 Create a Flight Plan ............................................................................... 3-36
3.10.1 Flight Plan Waypoint Options ......................................................... 3-37
3.11 Flight Plan Map Overlay ........................................................................ 3-38
3.12 GPS NAV Status .................................................................................... 3-39
Direct To .................................................................................................................................................3-40
3.13 Direct To Basics ..................................................................................... 3-40
3.13.1 Direct To Search Tabs ..................................................................... 3-40
3.13.2 Direct To Activation ........................................................................ 3-41
3.13.3 Navigating Direct To ....................................................................... 3-42
3.13.4 Removing a Direct-to Course .......................................................... 3-43
3.13.5 User Holds ...................................................................................... 3-44
Waypoints ..............................................................................................................................................3-45
3.14 Waypoint Information ........................................................................... 3-45
3.15 Waypoint Selection ............................................................................... 3-48
3.15.1 Waypoint Autofill ........................................................................... 3-48
3.15.2 Search Tabs .................................................................................... 3-49
3.16 Create User Waypoints ......................................................................... 3-51
3.16.1 Define Waypoint Criteria ................................................................ 3-52
3.16.2 Edit an Existing User Waypoint ....................................................... 3-54
3.16.3 Import User Waypoints ................................................................... 3-54
3.17 Nearest ................................................................................................. 3-55
Procedures ............................................................................................................................................3-57
3.18 Flight Procedure Basics .......................................................................... 3-58
3.18.1 GPS Flight Phase Annunciations ...................................................... 3-60
3.19 Departures ............................................................................................ 3-62
3.19.1 Flight Plan Departure Options ......................................................... 3-63
3.20 Arrivals ................................................................................................. 3-64
3.20.1 Flight Plan Arrival Options .............................................................. 3-65
3.21 Approaches .......................................................................................... 3-66
3.21.1 Flight Plan Approach Options ......................................................... 3-68

iv GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
Table of Contents
3.21.2 Missed Approach ........................................................................... 3-69
3.21.3 Approach Hold ............................................................................... 3-70
3.21.4 DME Arc ........................................................................................ 3-72
3.21.5 RF Legs ........................................................................................... 3-73
3.21.6 Vectors to Final .............................................................................. 3-73
3.21.7 ILS Approach .................................................................................. 3-74
3.21.8 RNAV Approaches .......................................................................... 3-74
3.21.9 Visual Approach ............................................................................. 3-80
3.21.10 Autopilot Outputs ........................................................................ 3-82
4 PLANNING .............................................................................................................................. 4-1
Vertical Calculator ..............................................................................................................................4-3
4.1 VCALC Page ............................................................................................. 4-3
4.2 VCALC Setup ............................................................................................ 4-4
Fuel Planning ..........................................................................................................................................4-5
4.3 Fuel Planning Page .................................................................................... 4-5
4.3.1 Fuel Planning Modes .......................................................................... 4-5
4.3.2 Computing Fuel Statistics ................................................................... 4-7
DALT/TAS/Wind Calculator ............................................................................................................4-8
4.4 DALT/TAS/Wind Page ................................................................................ 4-8
4.4.1 Editing Input Data .............................................................................. 4-8
4.4.2 Computing DALT/TAS/Wind Statistics ............................................... 4-10
RAIM Prediction .................................................................................................................................4-11
4.5 RAIM Prediction Page .............................................................................. 4-11
4.5.1 Calculating RAIM Status ................................................................... 4-12
4.5.2 RAIM Status Indications .................................................................... 4-12
5 HAZARD AWARENESS ..................................................................................................... 5-1
Weather Awareness ............................................................................................................................5-3
5.1 Data Transmission Limitations ................................................................... 5-3
5.1.1 Line of Sight Reception ....................................................................... 5-3
5.1.2 Per FAA TSO-C157b ........................................................................... 5-4
5.1.3 NOTAM 30-Day Limitation ................................................................. 5-4
5.2 FIS-B Weather Display ............................................................................... 5-5
5.3 FIS-B Weather Setup ................................................................................. 5-6
5.4 FIS-B Weather Interactions ........................................................................ 5-7
5.5 FIS-B Weather Products ............................................................................. 5-8
5.5.1 Product Status .................................................................................... 5-8
5.5.2 Product Age ....................................................................................... 5-9
5.5.3 FIS-B NEXRAD .................................................................................. 5-10
5.5.4 METARs and TAFs ............................................................................ 5-12
5.5.5 AIRMETs ........................................................................................... 5-13
5.5.6 SIGMETs ........................................................................................... 5-14
5.5.7 PIREPs .............................................................................................. 5-14
5.5.8 Winds/Temps Aloft ........................................................................... 5-15
5.5.9 TFRs ................................................................................................. 5-15
5.6 Raw Text Reports .................................................................................... 5-16
5.7 FIS-B Ground Reception Status ................................................................ 5-18
Traffic Awareness .............................................................................................................................5-19
5.8 Traffic Applications ................................................................................. 5-19
5.8.1 Traffic Application Failures ................................................................ 5-20

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide v
Table of Contents
5.9 Traffic Display ......................................................................................... 5-21
5.10 Traffic Setup ......................................................................................... 5-25
5.10.1 Motion Vectors .............................................................................. 5-26
5.10.2 Altitude Filtering ............................................................................. 5-26
5.11 Traffic Interactions ................................................................................ 5-27
5.12 Traffic Annunciations ............................................................................ 5-28
5.13 Traffic Alerting ...................................................................................... 5-29
Terrain Awareness ............................................................................................................................5-31
5.14 Terrain Configurations .......................................................................... 5-31
5.14.1 GPS Altitude for Terrain .................................................................. 5-32
5.15 Database Limitations ............................................................................. 5-33
5.16 Terrain Display ...................................................................................... 5-34
5.17 Terrain Setup ........................................................................................ 5-35
5.18 Terrain Proximity ................................................................................... 5-36
5.18.1 Terrain Elevation Depictions ............................................................ 5-36
5.18.2 Obstacle Elevation Depictions ......................................................... 5-37
5.19 Terrain Alerting ..................................................................................... 5-39
5.19.1 Alert Types ..................................................................................... 5-39
5.19.2 Alerting Thresholds ........................................................................ 5-40
5.19.3 Inhibiting FLTA & PDA Alerts .......................................................... 5-41
5.19.4 FLTA & PDA Alerts .......................................................................... 5-42
6 MESSAGES .............................................................................................................................. 6-1
Advisory Messages ..............................................................................................................................6-2
6.1 Message Key ............................................................................................. 6-2
6.2 Airspace Advisories ................................................................................... 6-2
6.3 Database Advisories .................................................................................. 6-3
6.4 Flight Plan Advisories ................................................................................ 6-4
6.5 GPS/WAAS Advisories ............................................................................... 6-6
6.6 Navigation Advisories ................................................................................ 6-8
6.7 Pilot Specified Advisories ........................................................................... 6-9
6.8 System Hardware Advisories ................................................................... 6-10
6.9 Terrain Advisories .................................................................................... 6-13
6.10 Traffic System Advisories ....................................................................... 6-14
6.10.1 Traffic Advisories, GPS 175 ............................................................. 6-14
6.10.2 Traffic Advisories, GNX 375 ............................................................ 6-16
6.11 VCALC Advisories ................................................................................. 6-17
6.12 Waypoint Advisories ............................................................................. 6-17
7 QUALIFICATION .................................................................................................................. 7-1
7.1 Glove Qualification ................................................................................... 7-1
8 GLOSSARY ............................................................................................................................... 8-1

vi GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
INTENTIONALLY LEFT BLANK

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide vii
Warnings, Cautions, and Notes
WARNING
DO NOT USE TERRAIN AVOIDANCE DISPLAYS AS THE SOLE SOURCE OF INFORMATION
FOR MAINTAINING SEPARATION FROM TERRAIN AND OBSTACLES. GARMIN OBTAINS
TERRAIN AND OBSTACLE DATA FROM THIRD PARTY SOURCES AND CANNOT
INDEPENDENTLY VERIFY THE ACCURACY OF THE INFORMATION.
WARNING
DO NOT RELY SOLELY UPON TERRAIN PROXIMITY DATA FOR TERRAIN AVOIDANCE.
TERRAIN PROXIMITY IS NOT A CERTIFIED TERRAIN AWARENESS SYSTEM. IT IS AN AID
TO SITUATIONAL AWARENESS ONLY. USING TERRAIN PROXIMITY DATA DOES NOT
UNDER ANY CIRCUMSTANCES OR CONDITIONS RELIEVE THE PILOT’S RESPONSIBILITY
TO SEE AND AVOID TERRAIN OR OBSTACLES.
WARNING
ALWAYS REFER TO CURRENT AERONAUTICAL CHARTS AND NOTAMS FOR
VERIFICATION OF DISPLAYED AERONAUTICAL INFORMATION. DISPLAYED
AERONAUTICAL DATA MAY NOT INCORPORATE THE LATEST NOTAM INFORMATION.
WARNING
NEVER USE GPS ALTITUDE FOR VERTICAL NAVIGATION. THE ALTITUDE CALCULATED
BY GPS RECEIVERS IS GEOMETRIC HEIGHT ABOVE MEAN SEA LEVEL AND COULD VARY
SIGNIFICANTLY FROM THE ALTITUDE DISPLAYED BY PRESSURE ALTIMETERS (E.G., THE
OUTPUT FROM THE GDC 74A/B AIR DATA COMPUTER) OR OTHER ALTIMETERS IN THE
AIRCRAFT. ALWAYS REFER TO THE PRESSURE ALTIMETERS IN THE AIRCRAFT FOR
CURRENT PRESSURE ALTITUDE.
WARNING
NEVER USE EXPIRED DATABASES. UPDATE DATABASES REGULARLY TO ENSURE
CURRENCY. USE OUT OF DATE DATABASE INFORMATION AT YOUR OWN RISK.
WARNING
NEVER USE BASEMAP INFORMATION (LAND AND WATER DATA) AS THE SOLE MEANS
OF NAVIGATION. BASEMAP DATA IS INTENDED ONLY TO SUPPLEMENT OTHER
APPROVED NAVIGATION DATA SOURCES AND SHOULD BE CONSIDERED ONLY AN AID
TO ENHANCE SITUATIONAL AWARENESS.
WARNING
DO NOT RELY SOLELY UPON THE DISPLAY OF TRAFFIC INFORMATION TO
ACCURATELY DEPICT ALL OF THE TRAFFIC WITHIN RANGE OF THE AIRCRAFT. DUE TO
LACK OF EQUIPMENT, POOR SIGNAL RECEPTION, AND/OR INACCURATE
INFORMATION FROM AIRCRAFT OR GROUND STATIONS, TRAFFIC MAY BE PRESENT
THAT IS NOT REPRESENTED ON THE DISPLAY.

viii GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
Warnings, Cautions, and Notes
WARNING
NEVER USE DATALINK WEATHER INFORMATION FOR MANEUVERING IN, NEAR, OR
AROUND AREAS OF HAZARDOUS WEATHER. INFORMATION CONTAINED WITHIN
DATALINK WEATHER PRODUCTS MAY NOT ACCURATELY DEPICT CURRENT WEATHER
CONDITIONS.
WARNING
DO NOT USE THE INDICATED DATALINK WEATHER PRODUCT AGE TO DETERMINE
THE AGE OF THE WEATHER INFORMATION SHOWN BY THE DATALINK WEATHER
PRODUCT. DUE TO TIME DELAYS INHERENT IN GATHERING AND PROCESSING
WEATHER DATA FOR DATALINK TRANSMISSION, THE WEATHER INFORMATION
SHOWN BY THE DATALINK WEATHER PRODUCT MAY BE OLDER THAN THE
INDICATED WEATHER PRODUCT AGE.
WARNING
DO NOT RELY SOLELY UPON DATALINK SERVICES TO PROVIDE TFR INFORMATION.
ALWAYS CONFIRM TFR INFORMATION THROUGH OFFICIAL SOURCES SUCH AS
FLIGHT SERVICE STATIONS OR AIR TRAFFIC CONTROL.
WARNING
ALWAYS REFER TO CURRENT AERONAUTICAL CHARTS FOR APPROPRIATE MINIMUM
CLEARANCE ALTITUDES. THE DISPLAYED MSAs ARE ONLY ADVISORY IN NATURE AND
SHOULD NOT BE RELIED UPON AS THE SOLE SOURCE OF OBSTACLE AND TERRAIN
AVOIDANCE INFORMATION.
WARNING
DO NOT USE GPS TO NAVIGATE TO ANY ACTIVE WAYPOINT IDENTIFIED AS A “NON
WGS84 WPT” BY A SYSTEM MESSAGE. “NON WGS84 WPT” WAYPOINTS ARE DERIVED
FROM AN UNKNOWN MAP REFERENCE DATUM THAT MAY BE INCOMPATIBLE WITH
THE MAP REFERENCE DATUM USED BY GPS (KNOWN AS WGS84) AND MAY BE
POSITIONED IN ERROR AS DISPLAYED.
WARNING
DO NOT RELY SOLELY UPON THE DISPLAY OF TRAFFIC INFORMATION FOR COLLISION
AVOIDANCE MANEUVERING. THE TRAFFIC DISPLAY DOES NOT PROVIDE COLLISION
AVOIDANCE RESOLUTION ADVISORIES AND DOES NOT UNDER ANY CIRCUMSTANCES
OR CONDITIONS RELIEVE THE PILOT’S RESPONSIBILITY TO SEE AND AVOID OTHER
AIRCRAFT.

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide ix
Warnings, Cautions, and Notes
WARNING
DO NOT RELY ON THE ACCURACY OF ATTITUDE AND HEADING INDICATIONS IN
GEOGRAPHIC AREAS WHERE VARIATION IN THE EARTH’S MAGNETIC FIELD EXISTS.
THIS INCLUDES: NORTH OF 72° NORTH LATITUDE AT ALL LONGITUDES; SOUTH OF 70°
SOUTH LATITUDE AT ALL LONGITUDES; NORTH OF 65° NORTH LATITUDE BETWEEN
LONGITUDE 75° W. AND 120° W. (NORTHERN CANADA); NORTH OF 70° NORTH
LATITUDE BETWEEN LONGITUDE 70° W. AND 128° W. (NORTHERN CANADA); NORTH
OF 70° NORTH LATITUDE BETWEEN LONGITUDE 85° E. AND 114° E. (NORTHERN
RUSSIA); SOUTH OF 55° SOUTH LATITUDE BETWEEN LONGITUDE 120° E. AND 165° E.
(REGION SOUTH OF AUSTRALIA AND NEW ZEALAND).
WARNING
DO NOT RELY SOLELY UPON DATALINK SERVICES TO PROVIDE TFR INFORMATION.
ALWAYS CONFIRM TFR INFORMATION THROUGH OFFICIAL SOURCES SUCH AS
FLIGHT SERVICE STATIONS OR AIR TRAFFIC CONTROL.
WARNING
DO NOT LEARN OPERATIONAL PROCEDURES IN THE AIR. FOR SAFETY REASONS,
THOROUGHLY PRACTICE BASIC OPERATION ON THE GROUND BEFORE ACTUAL USE.
WARNING
REVIEW AND UNDERSTAND ALL ASPECTS OF THIS PILOT’S GUIDE. DOING SO REDUCES
THE RISK OF UNSAFE OPERATION.
WARNING
ALWAYS RESOLVE ANY DISCREPANCIES BETWEEN THE DISPLAY AND OTHER
NAVIGATION SOURCES WHEN THEY OCCUR. DURING FLIGHT OPERATIONS,
COMPARE DISPLAY INDICATIONS TO INFORMATION FROM OTHER NAVAIDS, VISUAL
SIGHTINGS, CHARTS, AND OTHER AVAILABLE SOURCES BEFORE CONTINUING
NAVIGATION.
CAUTION
DO NOT CLEAN DISPLAY SURFACES WITH ABRASIVE CLOTHS OR CLEANERS
CONTAINING AMMONIA. THEY WILL HARM THE ANTI-REFLECTIVE COATING.
CAUTION
ENSURE THAT ANY UNIT REPAIRS ARE MADE BY AN AUTHORIZED GARMIN
SERVICE CENTER. UNAUTHORIZED REPAIRS OR MODIFICATIONS COULD VOID
BOTH THE WARRANTY AND AFFECT THE AIRWORTHINESS OF THE AIRCRAFT.

x GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
Warnings, Cautions, and Notes
NOTE
All visual depictions contained within this document, including screen images
of the system panel and displays, are subject to change and may not reflect
the most current system and aviation databases. Depictions of equipment
may differ slightly from the actual equipment.
NOTE
The United States government operates the Global Positioning System and is
solely responsible for its accuracy and maintenance. The GPS system is
subject to changes which could affect the accuracy and performance of all
GPS equipment. Portions of the system utilize GPS as a precision electronic
NAVAID. Therefore, as with all NAVAIDs, information presented by the
system can be misused or misinterpreted and, therefore, become unsafe.
NOTE
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
NOTE
Interference from GPS repeaters operating inside nearby hangars can cause
an intermittent loss of attitude and heading displays while the aircraft is on
the ground. Moving the aircraft more than 100 yards away from the source
of the interference should alleviate the condition.
NOTE
Use of polarized eye wear may cause the flight displays to appear dim or
blank.
NOTE
This product, its packaging, and its components contain chemicals known to
the State of California to cause cancer, birth defects, or reproductive harm.
This notice is being provided in accordance with California’s Proposition 65.
If you have any questions or would like additional information, please refer
to our website at www.garmin.com/prop65.
NOTE
Operating the system in the vicinity of metal buildings, metal structures, or
electromagnetic fields can cause sensor differences that may result in
nuisance miscompare annunciations during start up, shut down, or while
taxiing. If one or more of the sensed values are unavailable, the annunciation
indicates no comparison is possible.

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide xi
Warnings, Cautions, and Notes
NOTE
The system responds to a terminal procedure based on data coded within
that procedure in the Navigation Database. Differences in system operation
may be observed among similar types of procedures due to differences in the
Navigation Database coding specific to each procedure.
NOTE
Do not use SafeTaxi functions as the basis for ground maneuvering. SafeTaxi
functions do not comply with the requirements of AC 120-76C and are not
qualified for use as an airport moving map display. SafeTaxi is to be used for
orientation purposes only.
NOTE
The FAA has asked Garmin to remind pilots who fly with Garmin
database-dependent avionics of the following:
• It is the pilot’s responsibility to remain familiar with all FAA regulatory and
advisory guidance and information related to the use of databases in the
National Airspace System.
• Garmin equipment will only recognize and use databases that are obtained
from Garmin or Jeppesen. Databases obtained from Garmin or Jeppesen that
have a Type 2 LOA from the FAA are assured compliance with all data quality
requirements (DQRs). A copy of the Type 2 LOA is available for each
applicable database and can be viewed at flyGarmin.com by selecting
“Aviation Database Declarations.”
• Use of a current Garmin or Jeppesen database in your Garmin equipment
is required for compliance with established FAA regulatory guidance, but
does not constitute authorization to fly any and all terminal procedures that
may be presented by the system. It is the pilot’s responsibility to operate in
accordance with established AFM(S) and regulatory guidance or limitations
as applicable to the pilot, the aircraft, and installed equipment.
NOTE
The pilot/operator must review and be familiar with Garmin’s database
exclusion list as discussed in SAIB CE-14-04 to determine what data may be
incomplete. The database exclusion list can be viewed at flyGarmin.com by
selecting “Aviation Database Declarations.”
NOTE
The pilot/operator must have access to Garmin and Jeppesen database alerts
and consider their impact on the intended aircraft operation. The database
alerts can be viewed at flyGarmin.com by selecting “Aviation Database
Alerts.”

xii GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
Compliance
NOTE
If the pilot/operator wants or needs to adjust the database, contact Garmin
Product Support.
NOTE
Garmin requests the flight crew report any observed discrepancies related to
database information. These discrepancies could come in the form of an
incorrect procedure; incorrectly identified terrain, obstacles and fixes; or any
other displayed item used for navigation or communication in the air or on
the ground. Visit flyGarmin.com and select “Aviation Data Error Report.”
NOTE
The navigation databases used in Garmin navigation systems contain Special
Procedures. Prior to flying these procedures, pilots must have specific FAA
authorization, training, and possession of the corresponding current, and
legitimately-sourced chart (approach plate, etc.). Inclusion of the Special
Procedure in the navigation database DOES NOT imply specific FAA
authorization to fly the procedure.
AC 90-100A Statement of Compliance
The Garmin navigational unit meets the performance and functional requirements of
FAA Advisory Circular (AC) 90-100A, U.S. Terminal and En Route Area Navigation
(RNAV) Operations.

About This Guide
190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide xiii
Record of Revision
Layout
Electronic Document Features
Versions of this guide are saved in Adobe Acrobat and are available for download at:
garmin.com/manuals
REVISION DATE CHANGE DESCRIPTION
1 02/06/19 Experimental Release.
A 03/20/19 Production Release.
B 04/17/19 Minor edits.
SECTION TITLE
1System at a Glance
2Get Started
3Navigation
4Planning
5Hazard Awareness
6Messages
7Qualification
8Glossary
The design and layout of this guide is
intended to provide clear, concise
sections written in the logical order
of a pilot’s flight instrument and
systems scan.

xiv GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
Reference Documentation
Reference Manuals
Reference Websites
DOCUMENT P/N
GDL 88 ADS-B Transceiver Pilot’s Guide 190-01122-03
WEBSITE ADDRESS
Aviation Limited Warranty https://www.garmin.com/en-US/legal/aviation-limited-warranty
Database Concierge Go to http://www.flygarmin.com/support and select
Database Management.
ADS-B Academy https://www.garmin.com/us/intheair/ads-b
Connext http://www.garmin.com/connext
FAA Regulatory and
Guidance Library https://rgl.faa.gov

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide 1-1
System at a Glance
1 System at a Glance
OVERVIEW
1.1 Display Layout .......................................................................................1-3
1.2 Unit Functions ......................................................................................1-4
PILOT INTERFACE
1.3 Unit Power ............................................................................................1-5
1.4 SD Card Slot..........................................................................................1-6
1.5 Touchscreen ..........................................................................................1-7
1.6 Control Knobs .....................................................................................1-11
1.7 Color Conventions...............................................................................1-13
COMPATIBLE EQUIPMENT
1.8 Line Replaceable Units .......................................................................1-14

1-2 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
System at a Glance
Overview
The GPS 175 and GNX 375 are the first 2” by 6.25” panel mount navigators to
employ full color capacitive touchscreen technology.
The GPS 175 is a TSO-C146e compliant GPS/WAAS navigator with en route,
terminal, and precision/non-precision approach capabilities. The GNX 375 combines
the functionality of the GPS 175 with a TSO-C112e (Level 2els, Class 1) compliant
mode S transponder.
Each unit is Bluetooth compatible, providing flight plan, traffic, weather, and
position data to an available portable electronic device.
GPS 175 NAVIGATOR
•Certified compatible with ADS-B Out 2020 mandate
•TSO-C146e compliant GPS/WAAS navigator and internal GPS source
•TSO-C195b (Class B1, B3, B5, B7) compliant with an external active
ADS-B In source
GNX 375 NAVIGATOR WITH TRANSPONDER
•TSO-C88b compliant automatic pressure altitude reporting equipment
•TSO-C146e compliant GPS/WAAS navigator
•TSO-C112e (Level 2els, Class 1) compliant mode S transponder
•TSO-C154c (Class A1S) compliant 1090/UAT receiver
•TSO-C157b (Class 1) compliant FIS-B equipment uplink
•TSO-C166b compliant ADS-B Out 1090 MHz extended squitter
•TSO-C195b (Class B1, B3, B5, B7, C1, C2, C3, C5, C7) compliant
ADS-B In source

190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide 1-3
System at a Glance
1.1 Display Layout
1
Bezel
Includes the power key, mechanical knobs, photocell, and SD card slot.
Ledges provide hand stability when performing data entry and making
selections.
2Touchscreen
Multi-touch color display provides controls for unit operation.
3
Photocell
Measures cockpit ambient light level to automatically adjust display
brightness for day and night.
4
SD Card Slot
Interface for loading database, exporting log files, and updating
software. Compatibility with Flight Stream 510 allows wireless database
transfer from the Garmin Pilot app via Database Concierge.
5Power/Home Key
Powers the unit on or off and provides direct access to the Home page.
6
Inner & Outer Knobs
Multipurpose dual concentric knob allows data entry, list scrolling, map
range control, and page navigation.
1
5
3
4
6
2

1-4 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. B
System at a Glance
1.2 Unit Functions
[1] Requires external ADS-B In product.
[2] ADS-B In via 1090 MHz (traffic) and 978 MHz UAT (traffic and weather).
[3] Requires Wi-Fi connection via Flight Stream 510.
GPS 175 NAVIGATOR GNX 375 NAVIGATOR
W/TRANSPONDER
•Moving Map
•Terrain
•Flight Plan
•Graphical Flight Planning
•Waypoint Information
•Nearest
•FIS-B Weather Display [1] [2]
•ADS-B In Traffic Display [1] [2]
•Terrain Avoidance
•System Advisories
•Scheduled Messages
•Clock
•CDI
•Internal GPS Receiver
•Built-in Bluetooth
•Database Concierge Access [3]
•Moving Map
•Terrain
•Flight Plan
•Graphical Flight Planning
•Waypoint Information
•Nearest
•FIS-B Weather Receiver & Display [2]
•ADS-B In Traffic Receiver & Display
[2]
•ADS-B Out on 1090 MHz Extended
Squitter
•Terrain Avoidance
•System Advisories
•Scheduled Messages
•Clock
•CDI
•Internal GPS Receiver
•Built-in Bluetooth
•Mode S Transponder
•Database Concierge Access [3]